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Analog Devices Inc./Maxim Integrated MAX6418UK44+T
- Part No.:
- MAX6418UK44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK44+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,204
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Product details
Overview
MAX6418UK44+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (4.375V, ±2.5%) and one adjustable RESET IN input (1.26V threshold) for monitoring secondary rails. It features an active-low push-pull RESET output, capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), 1.7µA typical quiescent current, and operates from -40°C to +125°C in automotive-grade SOT23-5 packaging. It is used in battery-powered controllers requiring reliable dual-rail brownout detection.
For engineers reviewing the MAX6418UK44+T datasheet, MAX6418UK44+T pinout, MAX6418UK44+T application, or MAX6418UK44+T equivalent, key selection criteria include dual-voltage monitoring capability, guaranteed RESET validity down to VCC = 1V, AEC-Q100 qualification status, capacitor-programmable timeout delay, and SOT23-5 footprint compatibility with space-constrained embedded systems.
Technical Context
The MAX6418UK44+T integrates two independent voltage monitoring paths: a laser-trimmed bandgap reference sets the fixed 4.375V VCC threshold, while a high-impedance comparator monitors RESET IN against a precise 1.26V internal reference-enabling external resistor-divider configuration for custom VMON_TH thresholds. Reset assertion occurs if either rail falls below its threshold or manual reset is triggered.
Reset deassertion is governed by an internal 240nA current source charging an external capacitor on the SRT pin; the resulting ramp must reach 0.65V to terminate the timeout period. The active-low push-pull RESET output drives logic-compatible loads up to 3.2mA sink at VCC ≥ 4.5V, with VOL ≤ 0.4V and VOH ≥ 0.8×VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 4.375V ±2.5% over -40°C to +125°C - ensures accurate power-rail supervision for 4.5V nominal systems with margin for drift. |
| Adjustable Input Threshold | 1.26V ±33mV hysteresis - enables precise dual-rail monitoring via external resistor divider (e.g., 3.3V, 2.5V, 1.8V rails). |
| Reset Timeout Range | 275µs (no cap) to 5.75ms (1500pF) - supports μP reset timing requirements across diverse boot sequences. |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V - extends battery life in always-on portable and automotive subsystems. |
| Operating Temperature | -40°C to +125°C - meets extended industrial and automotive under-hood thermal requirements. |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up, delivers rail-to-rail logic levels compatible with CMOS inputs. |
| VCC Validity Range | RESET guaranteed valid down to VCC = 1.0V - ensures deterministic behavior during deep brownout conditions. |
Pinout & Package
SOT23-5 package (U5+2A outline, 5-pin, RoHS-compliant, lead-free). Thermal resistance θJA = 255.9°C/W (multi-layer board). Land pattern: 90-0174.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives μP reset input directly; sinks up to 3.2mA at VCC ≥ 4.5V; VOL ≤ 0.4V ensures solid logic low. |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be low-impedance connection to minimize noise coupling. |
| 3 - RESET IN | Adjustable voltage monitor input | High-impedance node (10nA leakage); connects to center tap of R1/R2 divider to set secondary rail threshold (VMON_TH = 1.26V × (R1+R2)/R2). |
| 4 - SRT | Reset timeout capacitor interface | 240nA precision current source charges external CSRT; layout requires short trace, no nearby digital signals to avoid timeout error. |
| 5 - VCC | Main supply and fixed-threshold monitor input | Supplies internal circuitry and feeds fixed 4.375V comparator; valid from 1.0V to 5.5V; reset asserted if VCC < 4.266V (min). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (4.375V) and secondary rail (via resistor divider on RESET IN), enabling single-chip protection for multi-rail SoC systems. |
| Capacitor-programmable reset timeout | External CSRT (0–1500pF) sets tRP from 275µs to 5.75ms - avoids fixed-delay limitations and supports custom boot timing without firmware changes. |
| AEC-Q100 qualified option | Available as /V variant - validated for automotive applications including engine control units and ADAS domain controllers requiring high reliability. |
| Low-power operation | 1.7µA typical ICC at VCC ≤ 2.0V - enables integration into always-on wake-up circuits and battery-backed subsystems without significant drain. |
| Power-supply transient immunity | Immune to VCC glitches ≤ 50µs when overdrive is 100mV - prevents spurious resets during switching noise or load transients. |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main logic rail and 3.3V MCU core supply in a CAN-connected body control unit exposed to wide temperature and voltage fluctuations. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-low RESET until both rails stabilize above thresholds and timeout expires. Use Value: Prevents erratic MCU operation during cold-cranking (VCC dip to 3.8V) or load dump events by holding reset until both rails are valid and stable. |
Use Scenario: Supervises 3.3V microcontroller and 1.8V analog front-end in a battery-powered infusion pump requiring fail-safe shutdown on power anomaly. IC Role / Device Role / Timing Role: Provides synchronized reset assertion across two critical voltage domains using single IC with shared timeout. Use Value: Eliminates risk of partial initialization where MCU boots before analog sensors stabilize, ensuring deterministic safety-critical startup sequence. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Embedded in DIN-rail mounted PLC module operating continuously at 85°C ambient, monitoring 24V-to-5V DC/DC output and isolated 3.3V communication rail. IC Role / Device Role / Timing Role: High-temp-stable supervisor with dual-threshold detection and guaranteed operation to +125°C junction temperature. Use Value: Maintains system integrity during thermal stress by detecting brownout on either rail and enforcing minimum 3ms reset hold time for robust recovery. |
Use Scenario: Used in handheld multimeter with coin-cell backup, supervising main 3.0V Li-ion rail and 1.8V ADC reference supply during battery depletion. IC Role / Device Role / Timing Role: Ultra-low-current supervisor enabling long shelf life while ensuring clean reset on voltage sag below 2.85V (VCC) or 1.7V (VMON_TH). Use Value: Extends usable battery life by >15% versus higher-IQ supervisors, with no compromise in reset accuracy or timing control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK44+T | Active-high push-pull RESET output instead of active-low; identical dual-monitoring architecture and thresholds. | Requires inverted reset logic on host µP; unsuitable for systems expecting active-low reset assertion. | Select MAX6419UK44+T only when µP reset pin is active-high and PCB layout cannot accommodate level-shifting. |
| TPS3808G33DBVR | Fixed 3.3V VDD monitor only; no adjustable second input; uses internal timer (not capacitor-adjustable); 1.6µA IQ. | Lacks dual-rail capability; limited to single-supply systems; reset timeout not user-tunable. | Choose TPS3808G33DBVR only for cost-sensitive single-rail applications where adjustable timeout and secondary rail monitoring are unnecessary. |
Compared with MAX6418UK44+T, MAX6419UK44+T offers identical dual-monitoring functionality but requires active-high reset logic compatibility, while TPS3808G33DBVR reduces design flexibility by omitting adjustable monitoring and capacitor-based timeout tuning-making MAX6418UK44+T uniquely suited for multi-rail, timing-critical embedded systems.
Availability
MAX6418UK44+T is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pump controllers, industrial PLC I/O modules, portable test equipment, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK44+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was developed specifically for ultra-low-power, dual-rail microprocessor supervision in harsh environments-emphasizing AEC-Q100 qualification, wide temperature operation, and flexible reset timing.
FAQ
What is the fixed reset threshold voltage for MAX6418UK44+T?
The MAX6418UK44+T has a factory-trimmed VCC reset threshold of 4.375V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value corresponds to the "44" suffix in the part number per Maxim's Reset Voltages Suffix Table. The threshold is laser-trimmed for stability and does not require external calibration.
Does MAX6418UK44+T support dual-voltage monitoring, and how is the second voltage configured?
Yes, MAX6418UK44+T supports dual-voltage monitoring: the fixed 4.375V threshold monitors VCC, while the adjustable RESET IN pin monitors a second voltage using an external resistor divider. The internal 1.26V comparator reference allows setting VMON_TH = 1.26V × (R1 + R2)/R2 - enabling precise supervision of rails such as 3.3V, 2.5V, or 1.8V without additional components.
What is the function of the SRT pin on MAX6418UK44+T, and what capacitor value yields a 4ms reset timeout?
The SRT pin on MAX6418UK44+T connects to an external capacitor that sets the reset timeout period via a 240nA internal current source. Using the formula CSRT = (tRP − 275µs) / 2.71×10⁶, a 4ms timeout requires CSRT = (0.004 − 0.000275) / 2.71×10⁶ ≈ 1375pF. A standard 1500pF ceramic capacitor yields 4.375ms, matching the typical value in the Electrical Characteristics table.
Is MAX6418UK44+T qualified for automotive applications?
The base MAX6418UK44+T is specified for -40°C to +125°C operation and built in an AEC-Q100-capable process, but only variants with the "/V" suffix (e.g., MAX6418UK44/V+T) are formally AEC-Q100 qualified and tested per automotive stress standards. For automotive use, specify the /V version to ensure compliance with qualification requirements.
What is the maximum recommended leakage current for the capacitor connected to the SRT pin of MAX6418UK44+T?
The capacitor connected to the SRT pin of MAX6418UK44+T must have leakage current less than 10nA to prevent timing errors; ceramic capacitors are explicitly recommended in the datasheet for this reason. Higher-leakage types (e.g., electrolytic or certain tantalum) will cause premature timeout expiration or inconsistent delay, compromising system reliability.
MAX6418UK44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.375V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6418UK44+T FAQ
1.How can I place an order for MAX6418UK44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK44+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6418UK44+T reliable?
The price and inventory of MAX6418UK44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK44+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK44+T?
MAX6418UK44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK44+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6418UK44+T?
For technical support, including MAX6418UK44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK44+T requirements.
6.How does Aetrix verify that MAX6418UK44+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK44+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6418UK44+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK44+T?
All MAX6418UK44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK44+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6418UK44+T part is unused and in its original packaging.
Return procedure for MAX6418UK44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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